Widget/Popup language issue

We are not able to show the foodbooking.com widget/popup content in the language selected as default in GloriaFood admin panel: https://www.gloriafood.com/admin/app/other/advanced/restaurant_languages?acid=1056524

Whatever language we select as default (atm name:Italiano/id:66334), the widget content is displayed in English (id:66232). By widget content I mean strings like “Delivery fees”, “Opening hours”, “Close”, “Commission free ordering system with real-time confirmation”, etc.

Any ideas on what might be the issue?
The site url is: https://www.pizza-mozzarella.rs

Thanks

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